41785ce562
The VPU clock tree is slightly different on all three supported SoCs: Meson8 only has an input mux (which chooses between "fclk_div4", "fclk_div3", "fclk_div5" and "fclk_div7"), a divider and a gate. Meson8b has two VPU clock trees, each with an input mux (using the same parents as the input mux on Meson8), divider and a gates. The final VPU clock is a glitch-free mux which chooses between VPU_1 and VPU_2. Meson8m2 uses a similar clock tree as Meson8b but the last input clock is different: instead of using "fclk_div7" as input Meson8m2 uses "gp_pll". This was probably done in hardware to improve the accuracy of the clock because fclk_div7 gives us 2550MHz / 7 = 364.286MHz while GP_PLL can achieve 364.0MHz. Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Link: https://lkml.kernel.org/r/20190324151104.18397-5-martin.blumenstingl@googlemail.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.